Rotary pump



. FEB, 7, 1928;

J; W. GURLEY ROTARY PUMP iled Feb. 10. 1925 Patented Feb. 7; 1 928 NITEDSTATES;

' JOHN w. Gunner, or mnIANAroLIs, mnIAN-n.

Application filegl February 10,-"1925. Serial 110. 8,259.

' It is the object of my inventionto produce a pump of the type in whicha rotor provided with a plurality of retractible blades rotates withinan eccentricchamber so that I spaces between two adjacent blades, therotor. and the chamber walls alternatelyrincrease and diminish in size-Specific objects of my invention areto lessen the wear and friction lossin such a pump and to provide .0 means for preventing scoring of thecham ber wallor rotor surface owing to'grit or other foreign substanceswhich enter the pump. A further object of'my invention 1s to increasethe capacity of such a pump by 6 using the reciprocation of the bladesin their slots to aid in the pumping actions I accomplish the aboveobjects by providing in the exterior face of each blade a rocking shoewhich engaging the inner surface.

of the pump chamber and which is provided in its outerface with-arecesswhich has two openin s, oneof such openings being1n-the outer ace of'theblade to provide communication between the recess and thespace ahead'ofsuch blade in the direction of rotor rotation, and the other of whichopenings communicates through an opening in the blade with the spacebehind-suchblade.

Ahead of each blade in the direction of ro- 0 tor rotation I'prov'ide inthe surface of the rotor a, longitudinally extending groove inWhiOh'Wlll be accumulated any grlt or other foreign substance which mayenter the,

pump. I l The accompanying drawing illustrates my invention: Fig. 1 is alongitudinal central section of the pump on the ine 11 of Fig- 2; Fig. 2is a transverse section of the pump on the line 22 of Fig. 1: Fig. 3 isa perspective view of one of the blade-shoes used;

and Fig. 4 is a perspective view of one-of the reciprocating blades.-

My pump comprises a casing provided with an inlet opening 11, an outletopen- 5 ing 12, anda longitudinally extending cylindrical chamber 13.Mounted on each end of the casin 10 is an end late'14, preferably proviedwitha bear 1ng ..boss to rovlde a bearing forthe rotorshaft 16. 0 Therotor shaft 16 extends longitudinally of the casing and passes throughthe chamber 13, but is not co-axial with such chamber. On its outer end,the shaft 16 may be provided with-a pulley-17 for the purpose of drivingit. A passage 20, located on the wall of the cham er 13, serves toconnect the inlet opening 11 with a recess 21 located in one or both ofthe end plates 14. These recesses 21 extend toward the center of thechamber 13 6.0 and serve to connect the chamber 13 with the inletopening 11 through the longitudinally extending-passage 20. A secondlongitudinally extending passage 22', located in the wall of the casing,preferably opposite the passage 20, communicates with a recess 23 in oneor both of the-end plates 14. The

recess or recesses 23 are similar to the recess or recesses 21 and serveto connect the chamber 13 with the outlet opening 12 through the passage22.

Within the chamber- 13, there is rigidly mounted on the shaft 16 acylindrical rotor 25-. In the surface of the rotor 25 there are apluralityof grooves in each of which there 7 is slidably mounted a blade26. Preferably,

these grooves are arranged in pairs with the grooves of each pairdiametrically opposite each other. Extending between opposite grooves ispne or more holes for the reception of pins 27 rigidly attached to eachblade 26. The pins 2. are of such a length thatloppositepins abut eachother when the blades to which they are attached most closely approacheach other.

The outer surface of each of the blades 20 is provided with a groove 28for'the reception of a rockin shoe 30, the inner surface of such shoeeing shaped to fit the cove 28, and the outer surface of such shoe 90eing'a portion of a cylindrical surface of a radius equal'to that of thechamber 13. Thus, the outer surface of each shoe 30 will always befirmly seated against the wall of provided with a notch 33, in line withthe opening 32. From the bottom of each recess 31 there extends throughthe shoe a hole 34 which communicates with a hole 35 passing through theassociated blade 26.

In the surface of the rotor, ahead of each blade, I provide alongitudinally extending groove 38. Grit or foreign substances which henter the pump tend to become wedged between the rotor and the wall ofthe chamber 13 at the point where .the rotor most closely approachessuch wall. The grooves 38 serve as pockets in which such grit may bedeposited and thus removed from the surface of the rotor or thewall ofthe chamber. The removal in this fashion 01 any grit that may enter thepump prevents scoring the surfaces of the rotor and chamber wall.

The blades 26 and shoes 30 serve to divide into four partsthe spacebetween the rotor and the walls of the chamber 13. With the rotorrotating in-a clockwise direction (Fig. 2) the spaces between adjacentblades on the right-hand side of the rotor will be expanding and thoseon the left-hand side of the rotor will be contracting. Thus, fluid willbe drawn in through the inlet 0 ening 11, passage 20, and recesses 21 toll the expanding spaces on the right side of the rotor, and this fluidwill be expelled by the contraction of such spaces when the reach theleft-hand side of the pump. his is the manner in which all pumps of thistype operate. By my improved construction, however, the reciprocation ofthe blades themselves is used to increase the capacity of the pump, forthe space between each blade and the bottom of the groove in which it isreceived is expandin when such space, is in communication wit therecesses 21 and is contracting when such space communicates with therecess 23. Thus each blade operates in the manner of the, piston of areciprocating pump. The pressure between each blade and the bottom ofits groove is communicated through the holes 34 and 35 to the recesses30 in the face of the blade shoe, and the pressure in the recess 31serves to partially balance that beneath each blade. Thus, the forcewith which each blade shoe is ressed against the wall of the chamber 131s materially reduced and wearing of the shoe'surface and friction lossis correspondingly diminished. The holes 34 and 35 and the o ening 32provide a passage for the fluid orced out from the space between eachblade and the bottom of its groove.

I claim as my invention 1. In a rotary pump having a shell, a rotoreccentrically mounted in said shell, retractible blades carried by saidrotor; wearing shoes mounted in said blades and engaging said shell,said wearing shoes having recesses in their shell-engaging faces, eachof said recesses communicating with the space be-' rotor eccentricaltween said rotor and said shell and immediately ahead of said shoe inthe direction of rotation of said rotor. I

2. In a rotary pump having a shell, a

y mounted in said shell, retractible elements carried by said rotor andengaging said shell, said retractible elements aving recesses in theirshell-engaging faces, each of said recesses communicatin with the spacebetween said shell and said rotor and immediately ahead of said elementin the direction of rotor rotation.

3. A rotar pump, comprising a shell, a rotor rotatab y mounted in saidshell, a plurality of retractible elements mounted on said rotor andengaging said shell, said shell being arranged so that the spacesbetween it, said rotor, and adjacent retractible elements willalternately increase and decrease in size as said rotor is rotated, aninlet open ing and an outlet opening for said shell, each of saidretractible elements having a recess in its shell-engaging face, each ofsaid recesses communicating with the space between said shell and saidrotor and immediately ahead of said element in the direction of rotorrotation.

4. A rotary pump, comprising a shell, a rotor rotatably mounted in saidshell, a plu-. rality of retractible blades mounted on said rotor andengaging said shell, said shell being arranged so that the spacesbetween it, said rotor, and adjacent retractible blades will alternatelyincrease and decrease in size as said rotor is rotated, an inlet openingand an'outletopening for said shell, a wearing shoe mounted in each ofsaid blades and engaging said shell, each of said wearing shoes having arecess in its shell-engaging face, each of said recesses communicatingwith the space between said rotor and sai shell and. immediately aheadof said shoe in the direction of rotation of said rotor.

5. A rota pump, comprising a shell having inlet-an outlet 0 emngs arotor rotatab y mounted in said s ell an having a Inrah'ty oflongitudinal grooves in its ace, shell-engaging elements mounted in saidgrooves for radial sliding therein, said shell being arranged so thatsaid shell-engaging elements slide inwardly and outwardly in saidgrooves as said rotor is rotated, and a fluid passage through saidshell-engagin element connecting the space between sue element and thebottomof its associated groove with the space between said rotor andsaid shell 'and immediately ahead of such element in the direction ofrotor rotation.

6. A rotary pump, comprising a shell having inlet and outlet 0 enings inthe ends thereof, a rotor rotate 17 mounted in said shell and havin aplurality of longitudinal grooves in its ace, shell-engaging elementsmounted in said grooves for-radial sliding therein,--=said shell beingarranged so that III said shell-engaging elements slide inwardly andoutwardl in said grooves as said rotor. s rotated, and a fluid passageconnecting the space between such element and the bottom of itsassociated groove with the space between said rotor and said shell andimmediately ahead of such element in the direction of rotor rotation.

7. A rotary pump as set forth in claim 5 with the addition that saidshell-engaging elements are provided with recesses in theirshell-engaging faces, said fluid passage leading through said recesses.

8. A rotary pump, comprising a shell having inlet and outlet openings, arotor rotatably mounted in said shell and having a plurality oflongitudinal grooves in its face, shell-engaging elements mounted insaid grooves for radial sliding therein, said shell being arranged sothat said shell-engaging elements slide inwardly and outwardly in saidgrooves as said rotor is rotated, each of said shell-engaging elementshaving a recess in its shell-engaging face, and a fluid passageconnecting said recess with the space between each shell-engagingelement and the bottom of its associated groove.

9. A rotary pump, comprising a shell haw ing inlet and outlet openings,a rotor rotatably mounted in said shell and having a plurality oflongitudinal grooves in its face, blades mounted in said grooves forradial sliding therein, said shell being arranged so that said bladesslide inwardly and outwardly in said grooves as said rotor is rotated,

wearing shoes mounted in said blades and engaging said shell, each ofsaid wearing shoes havin a recess in its shell-enga ing face, and a uidpassage connecting sai recess with the space between its associatedblade and the bottom of the groove in which said blade slides.

10. In a rotary pump having a shell, a rotor eccentrically mounted insaid shell, retractible blades carried by said rotor; Wearing shoesmounted in said blades and engaging said shell, said wearing shoeshaving recesses in their shell-engaging faces.

11. A rotary pump, comprising a shell having inlet and outletopenings, arotor rotatably mounted in said shell and having a plurality oflongitudinal grooves in its face, shell-engaging elements mounted insaid grooves for radial sliding therein, said shell being arranged sothat said shell-engaging elements slide inwardly and outwardly in saidgrooves as said rotor is rotated, said inlet openin being arranged tocommunciate with 'eaci of said grooves through the end thereof as theshell-engaging element in such groove slides outwardly, and said outletopening being arranged to communicate with each of said grooves throughthe end thereof as the associated shell-engaging element slidesinwardly.

In witness whereof, I have hereunto set my hand at Indianapolis,Indiana, this 30th day of January, A. D.-one thousand nine hundred andtwenty five.

JOHN W. GURLEY.

